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arXiv 2004.11872cond-mat.str-el
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倾斜磁场下量子Hall态的集体激发

Collective excitations of quantum Hall states under tilted magnetic field

Kang Yang, Mark Goerbig, Benoît Douçot

摘要:

研究了在倾斜磁场引入各向异性的有限宽度电子系统中分数量子霍尔态的中性激发。与各向同性情形一样,由于量子阱宽度的限制,相互作用势有一个自然截止,因此中性集体激发可以通过哈密顿理论中复合费米子守恒的方法计算出来。我们展示了如何这样的计算可以进行微扰的各向异性相互作用。我们发现,不同于电荷间隙,中性集体间隙是更敏感的倾斜,因此,对于某些分数量子霍尔态,可以很容易地被破坏的平行分量的磁场。我们还讨论了在大动量极限下集体谱向激活能隙的收敛。

英文摘要:

We study the neutral excitations of fractional quantum Hall states in electronic systems of finite width where an external anisotropy is introduced by tilting the magnetic field. As in the isotropic case, the neutral collective excitation can be worked out through the conserving method of composite fermions in the Hamiltonian theory because the interaction potential has a natural cutoff due to the quantum well width. We show how such a computation can be carried out perturbatively for an anisotropic interaction. We find that unlike the charge gap, the neutral collective gap is much more sensitive to the tilt and can thus, for certain fractional quantum Hall states, be easily destroyed by the parallel component of the magnetic field. We also discuss the convergence of the collective spectrum to the activation gap in the large-momentum limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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